Securities - Fair Value and Age of Gross Unrealized Losses by Investment Category (Details) $ in Thousands	Dec. 31, 2022 USD ($) security	Dec. 31, 2021 USD ($) security
Number of Securities
Less Than 12 Months | security	116	30
12 Months or More | security	31	1
Total | security	147	31
Fair Value
Less Than 12 Months	$ 663,656	$ 372,499
12 Months or More	308,067	8,933
Total	971,723	381,432
Unrealized Losses
Less Than 12 Months	(46,120)	(5,393)
12 Months or More	(56,462)	(374)
Total	$ (102,582)	$ (5,767)
U.S. Treasury securities
Number of Securities
Less Than 12 Months | security	6	8
12 Months or More | security	8	0
Total | security	14	8
Fair Value
Less Than 12 Months	$ 57,057	$ 85,221
12 Months or More	74,638	0
Total	131,695	85,221
Unrealized Losses
Less Than 12 Months	(3,363)	(742)
12 Months or More	(10,358)	0
Total	$ (13,721)	$ (742)
Obligations of U.S. government corporations and agencies
Number of Securities
Less Than 12 Months | security	6
12 Months or More | security	0	0
Total | security	6	0
Fair Value
Less Than 12 Months	$ 41,811	$ 0
12 Months or More	0	0
Total	41,811	0
Unrealized Losses
Less Than 12 Months	(1,668)	0
12 Months or More	0	0
Total	$ (1,668)	$ 0
Collateralized mortgage obligations of U.S. government corporations and agencies
Number of Securities
Less Than 12 Months | security	47	12
12 Months or More | security	13	1
Total | security	60	13
Fair Value
Less Than 12 Months	$ 296,509	$ 141,204
12 Months or More	112,902	8,933
Total	409,411	150,137
Unrealized Losses
Less Than 12 Months	(28,153)	(2,436)
12 Months or More	(25,682)	(374)
Total	$ (53,835)	$ (2,810)
Residential mortgage-backed securities of U.S. government corporations and agencies
Number of Securities
Less Than 12 Months | security	25	3
12 Months or More | security	3	0
Total | security	28	3
Fair Value
Less Than 12 Months	$ 7,143	$ 46,042
12 Months or More	34,223	0
Total	41,366	46,042
Unrealized Losses
Less Than 12 Months	(589)	(628)
12 Months or More	(7,245)	0
Total	$ (7,834)	$ (628)
Commercial mortgage-backed securities of U.S. government corporations and agencies
Number of Securities
Less Than 12 Months | security	30	7
12 Months or More | security	7	0
Total | security	37	7
Fair Value
Less Than 12 Months	$ 241,009	$ 100,032
12 Months or More	86,304	0
Total	327,313	100,032
Unrealized Losses
Less Than 12 Months	(11,975)	(1,587)
12 Months or More	(13,177)	0
Total	$ (25,152)	$ (1,587)
Corporate Obligations
Number of Securities
Less Than 12 Months | security	0	0
12 Months or More | security	0	0
Total | security	0	0
Fair Value
Less Than 12 Months	$ 0	$ 0
12 Months or More	0	0
Total	0	0
Unrealized Losses
Less Than 12 Months	0	0
12 Months or More	0	0
Total	$ 0	$ 0
Obligations of states and political subdivisions
Number of Securities
Less Than 12 Months | security	2	0
12 Months or More | security	0	0
Total | security	2	0
Fair Value
Less Than 12 Months	$ 20,127	$ 0
12 Months or More	0	0
Total	20,127	0
Unrealized Losses
Less Than 12 Months	(372)	0
12 Months or More	0	0
Total	$ (372)	$ 0